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The thigh contains some of the body's largest muscles, which are responsible for a variety of movements, including bending, flexing, and rotating the lower body. These muscles are prone to injury, especially in athletes, due to the strain placed on them during activities such as running, jumping, and changing directions. Thigh muscles originate in the pelvic girdle and insert into the femur, with some crossing the hip and knee joints. They include the hamstrings, adductors, quadriceps, and pectineus muscles, as well as the iliopsoas group, which is made up of the iliacus, psoas major, and psoas minor muscles. The gluteal muscles, such as the gluteus maximus, medius, and minimus, also play a role in thigh movement.
| Characteristics | Values |
|---|---|
| Thigh muscle injuries | Common in athletes due to the movements they make with their bodies |
| Ways to keep thigh muscles healthy | Avoid sports that involve quick direction changes or tackling, stop and rest when something hurts, eat protein-rich foods, maintain a healthy weight, stay hydrated, warm up and stretch, wear appropriate shoes and safety gear |
| Muscle that enables you to flex and rotate your thigh at the hip joint | Pectineus |
| Muscles that enable you to bring your thighs toward each other | Adductors |
| Muscles that enable you to flex your hip or extend your knee | Quadriceps |
| Muscles that enable you to extend (tilt) your hip to move your leg behind your body or flex (bend) your knee | Hamstrings |
| Longest muscle in the body | Sartorius |
| Muscle that lies in the middle of your thigh | Vastus intermedius |
| Largest quad muscle | Vastus lateralis |
| Smallest quad muscle | Vastus medialis |
| Muscle that enables you to flex the trunk, hip and externally rotate the thigh | Iliacus |
| Muscle that flexes and laterally flexes and rotates the thigh at the hip joint | Psoas major |
| Muscle that lies anterior to psoas major | Psoas minor |
| Muscles that move the thigh | Adductor longus, adductor brevis, adductor magnus, pectineus, iliopsoas, gluteus maximus, gluteus medius, gluteus minimus, tensor fasciae latae, piriformis, obturator internus, obturator externus, gemellus superior, gemellus inferior, quadratus femoris |
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What You'll Learn
Hamstrings
Hamstring muscles are skeletal muscles located at the back of the thigh, starting at the pelvis and extending to the knee. They are made up of thousands of long, elastic muscle fibres that help the leg muscles contract or tighten. The three hamstring muscles are the biceps femoris, semitendinosus, and semimembranosus. These muscles are responsible for flexing the knee, extending the hip, and rotating the lower leg. For example, when you walk and put one leg behind you, or when you squat.
Hamstring muscles are susceptible to injury, especially in athletes who run, sprint, or jump. These activities can put a lot of strain on the hamstrings, and a common injury is a "pulled hamstring" or strain. This occurs when the muscle fibres overstretch but don't tear, resulting in mild pain or swelling. More severe injuries can include a partial tear or a complete tear, where the muscle tissue completely tears away from the tendon or bone.
To avoid hamstring injuries, it is important to stretch, warm up, and not push through pain in the hip, knee, and leg. Maintaining a healthy weight and staying hydrated can also help reduce the risk of hamstring injuries. Hamstring injuries are common, with an incidence of about two per 1000 hours of performance in sports and professional dancing. The biceps femoris is the most commonly injured hamstring muscle.
In summary, hamstring muscles are crucial for many daily activities and play an important role in the complex gait cycle during walking. They are also susceptible to injuries, especially in athletes, and proper precautions should be taken to avoid hamstring strains and tears.
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Adductors
There are three main adductor muscles in the thigh: the adductor longus, adductor brevis, and adductor magnus. These muscles originate from the pubic bone and insert into the femur. The adductor longus is particularly important for flexing the thigh, while the adductor magnus is responsible for extending it. The pectineus muscle also contributes to adduction and flexion at the hip joint.
The adductors are susceptible to injuries, commonly referred to as a "groin pull" or "pulled groin". This can occur when the adductor muscles are strained, torn, or over-stretched. To prevent such injuries, it is important to strengthen and stretch the adductors, improving their flexibility and making them better able to handle the demands of physical exercise.
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Quadriceps
The rectus femoris originates from the anterior inferior iliac spine and the superior edge of the acetabulum. It is a biarticular muscle and can flex the hip. The other parts of the quadriceps arise from the surface of the femur. The vastus lateralis originates from the lateral face of the great trochanter, the gluteal tuberosity, and the lateral lip of the linea aspera. The vastus medialis runs from the anatomical neck of the femur and the medial lip of the linea aspera. The vastus intermedius originates from the proximal femur and inserts at the base of the patella. The tensor vastus intermedius originates from the anteroinferior portion of the great trochanter and inserts distally at the medial aspect of the patellar base.
The four heads of the quadriceps come together to form a single tendon, the quadriceps tendon, which connects to the kneecap (patella). The vastus lateralis, vastus medialis, and rectus femoris work together to extend the knee. The rectus femoris, by attaching to the ilium, is also a flexor of the hip, swinging the leg forward during walking or running. The vastus medialis helps to stabilize the patella and the knee joint during gait.
The quadriceps are crucial for daily activities such as walking, running, jumping, and climbing stairs. They are also important in sports, especially activities involving kicking, changing directions, and other movements. However, this also makes them prone to various injuries, including strains, contusions, and tendonitis. To prevent injuries, it is important to warm up, stretch, and rest the quadriceps when needed.
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Pectineus
The pectineus muscle is a flat, quadrangular muscle located at the anterior (front) part of the upper and medial (inner) aspect of the thigh. It is considered a transitional muscle between the anterior thigh and the medial thigh. The muscle is responsible for hip flexion, adduction, and external rotation of the hip. It is also a postural muscle, stabilising the pelvis and balancing the trunk on the lower extremity during walking.
The pectineus muscle arises from the pectineal line of the pubis and, to a lesser extent, from the surface of the bone in front of it, between the iliopectineal eminence and pubic tubercle. The fibres pass downward, backward, and lateral, inserting into the pectineal line of the femur, which leads from the lesser trochanter to the linea aspera. The muscle has the most superior attachment of all the thigh adductors.
The pectineus muscle is innervated by the femoral nerve (L2 and L3) and, in some cases, by the accessory obturator nerve, a branch of the obturator nerve. The femoral nerve is the greater nerve to the muscle and is always present, providing the sole innervation for the pectineus muscle in over 90% of cases. The muscle is classified into the anterior compartment of the thigh when the nerve is emphasised.
The pectineus muscle can be injured by overstretching, such as stretching the leg too far to the side or front of the body. Rapid movements like kicking or sprinting, changing directions too quickly while running, or even sitting with a leg crossed for too long can also cause injury. Treatment for a pectineus muscle injury includes protecting the injured area, minimising activities that use the muscle, and icing the injury to decrease swelling and pain.
The pectineus muscle is one of the muscles located on the medial thigh, along with the adductor longus, adductor brevis, adductor magnus, and gracilis muscles, which primarily function in hip adduction.
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Iliopsoas
The iliopsoas muscle is a combination of the psoas major and the iliacus muscles, with the psoas minor contributing in some cases. The psoas major and iliacus muscles are separate in the abdomen but usually merge in the thigh. They share a common insertion point on the lesser trochanter of the femur. The iliopsoas is the prime mover of hip flexion and is the strongest of the hip flexors. It is also important for standing, walking, and running.
The iliopsoas muscle is a typical posture muscle, dominated by slow-twitch red type 1 fibres. It originates from the lumbar vertebrae and discs and then inserts onto the femur. The iliopsoas gets innervation from the L2-4 nerve roots of the lumbar plexus, which also send branches to the superficial lumbar muscles. The femoral nerve passes through the muscle and innervates the quadriceps, pectineus, and sartorius muscles. It is supplied by the lumbar spinal nerves L1–L3 (psoas) and parts of the femoral nerve (iliacus).
The psoas major is a long, thick, and fusiform muscle that lies lateral to the lumbar vertebrae and medial to the quadratus lumborum. It originates from the T12-L4 vertebrae and descends to insert onto the lesser trochanter of the femur after fusing with the iliacus muscle. The iliacus is a large, triangularly shaped muscle that lies over the surface of the ilium, lateral to the lower part of the psoas major and psoas minor muscles. Its fibres merge with those of the psoas major around the level of the inguinal ligament to become the iliopsoas muscle.
The psoas minor is a long, thin, and fusiform muscle that lies anterior to the psoas major. It originates from the last thoracic vertebra and the first lumbar vertebra and is present in about 60-65% of individuals. The iliopsoas muscle complex can function as a unit or as separate muscles.
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Frequently asked questions
The muscles that move the thigh include the iliopsoas, adductor longus, adductor brevis, adductor magnus, pectineus, gluteus maximus, gluteus medius, gluteus minimus, and tensor fasciae latae.
The iliopsoas muscle is a combination of the psoas major and iliacus muscles, which share a common insertion point on the femur. It acts as a hip flexor, allowing for flexion and rotation of the thigh at the hip joint.
The adductor muscles include the adductor longus, adductor brevis, and adductor magnus. These muscles originate from the pubic bone and insert into the femur, allowing for adduction and rotation of the thigh.
The gluteal muscles include the gluteus maximus, gluteus medius, and gluteus minimus. The gluteus maximus is the largest and functions to extend the femur and rotate it laterally at the hip joint. The gluteus medius and minimus act as femoral abductors and medial rotators.
The quadriceps muscles, including the rectus femoris and vastus muscles, help to extend the lower limb at the knee joint and stabilize the patella. They also enable actions such as kicking, running, and jumping.
